When a mischievous new speedster starts stirring up trouble in Central City under the guise of The Flash, it's up to Barry (Grant Gustin) to stop her from ruining his squeaky-clean image. But if the Scarlet Speedster wants to stop Trajectory (guest star Allison Paige), he's going to have to catch her first.

"If you ask Trajectory she will say that not only is she The Fastest Woman Alive, but that she is also faster than The Flash," Paige told MTV News ahead of her March 22 debut on The Flash.

While Paige kept mum on exactly what (or who) gives Trajectory her speed -- for example, in the comics, Trajectory receives her powers from none other than Lex Luther -- she did reveal that there's a darker force at play, and no, it has nothing to do with evil uber-speedster Zoom.

"These powers are new to her, and she can be a little reckless with them. She's a little bit misguided," Paige said. "But as much of a troublemaker as she is, she definitely is not all bad. She doesn't know about Zoom. She's definitely in her own universe."

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Trajectory just wants to have fun, but unfortunately for Barry, her particular brand of fun comes at The Flash's expense. When a crimson-clad speedster starts committing petty crimes throughout the city, the Central City Picture News, lead by brash new editor Scott Evans (Tone Bell), begins to paint a more troublesome picture of The Fastest Man Alive.

"She definitely doesn't mind challenging Barry at all," the 26 year old said. "She doesn't mind causing a bit of a ruckus, and if he needs to take the blame for it, that's fine -- she doesn't necessarily mind that. He gets in the way of her fun. She just wants to do her thing and explore these powers and cause a little trouble, and he's this thorn in her side that she would like to go away."

In other words, Barry has no chill, especially when it comes to other metahumans dragging his good name through the mud. However, while Barry may be a thorn in Trajectory's side, she may hold a solution to his current problem: speed. It's no secret that the crew at S.T.A.R. Labs have been trying to increase Barry's speed to prepare for his fight against Zoom, and Trajectory may be the key in bolstering The Flash's speed.

"She will teach Barry a lot about his ability and his speed and what he's capable of," Paige said. "She challenges it, as well as helps him rise to the occasion."